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The Company and Significant Accounting Policies - Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 31, 2024 USD ($) Days $ / shares	Jul. 31, 2023 USD ($) Days $ / shares	Sep. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2024 shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Dec. 31, 2023 shares
Restricted Stock Units
Accounting Policies [Line Items]
Share-based compensation expenses | $			$ 3.3		$ 6.4	$ 11.7	$ 15.5
Total unrecognized compensation expense related to grants of restricted stock units | $			11.7			$ 11.7
Weighted average period for unrecognized compensation expense related to grants of restricted stock units						1 year 8 months 12 days
Performance Stock Units
Accounting Policies [Line Items]
Share-based compensation expenses | $			0.4		$ 0.3	$ 1.3	$ 0.3
Total unrecognized compensation expense related to grants of restricted stock units | $			$ 2.3			$ 2.3
Weighted average period for unrecognized compensation expense related to grants of restricted stock units						2 years 3 months 18 days
Share price			$ 4.38		$ 4.39	$ 4.38	$ 4.39
Number of consecutive trading days | Days	30	30
Performance period commencing date	Jan. 25, 2024	Jul. 01, 2023
Performance period ending date	Jan. 25, 2029	Jul. 01, 2028
Weighted Average Fair Value						$ 3.78
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares			600,000			600,000		1,000,000
Share based payment award cancelled | shares				300,000		300,000
Allocated percentage						25.00%		20.00%
Percentage of performance measurement						100.00%
Performance Stock Units | Tranche One
Accounting Policies [Line Items]
Share price	$ 4.83	$ 5.75
Fair value of each of the Tranches | $	$ 0.6	$ 0.8
Weighted Average Fair Value	$ 4.16	$ 3.98
Performance Stock Units | Tranche Two
Accounting Policies [Line Items]
Share price	$ 5.65	$ 7.25
Fair value of each of the Tranches | $	$ 0.6	$ 0.7
Weighted Average Fair Value	$ 3.98	$ 3.64
Performance Stock Units | Tranche Three
Accounting Policies [Line Items]
Share price	$ 7.15	$ 9
Fair value of each of the Tranches | $	$ 0.5	$ 0.7
Weighted Average Fair Value	$ 3.66	$ 3.31
Performance Stock Units | Tranche Four
Accounting Policies [Line Items]
Share price	$ 8.9	$ 11.2
Fair value of each of the Tranches | $	$ 0.5	$ 0.6
Weighted Average Fair Value	$ 3.32	$ 2.93
Performance Stock Units | Tranche Five
Accounting Policies [Line Items]
Share price		$ 13.75
Fair value of each of the Tranches | $		$ 0.5
Weighted Average Fair Value		$ 2.58
Minimum | Restricted Stock Units
Accounting Policies [Line Items]
Vesting period						1 year
Minimum | Performance Stock Units
Accounting Policies [Line Items]
Vesting percentage	0.00%	0.00%
Maximum | Restricted Stock Units
Accounting Policies [Line Items]
Vesting period						4 years
Maximum | Performance Stock Units
Accounting Policies [Line Items]
Vesting percentage	100.00%	100.00%

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